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You can open Office files stored on your andoid phone, you'll need to have opened the file in online mode at least once. You can work on it offline after you have opened it. You can save the file on your disk when offline. If you downloaded the file from an online location, such as emails, SharePoint, OneDrive, or Dropbox, your latest changes will be synchronized automatically with the online version. If you make further changes while offline, you'll need to save your changes by tapping File > Save.
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